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Showing content from https://docs.microsoft.com/en-us/dotnet/api/System.Collections.Generic.KeyValuePair-2 below:

KeyValuePair<TKey,TValue> Struct (System.Collections.Generic) | Microsoft Learn

Defines a key/value pair that can be set or retrieved.

generic <typename TKey, typename TValue>
public value class KeyValuePair

public struct KeyValuePair<TKey,TValue>

public readonly struct KeyValuePair<TKey,TValue>

[System.Serializable]
public struct KeyValuePair<TKey,TValue>

type KeyValuePair<'Key, 'Value> = struct

[<System.Serializable>]
type KeyValuePair<'Key, 'Value> = struct

Public Structure KeyValuePair(Of TKey, TValue)

TKey

The type of the key.

TValue

The type of the value.

Inheritance

KeyValuePair<TKey,TValue>

Attributes

The following code example shows how to enumerate the keys and values in a dictionary, using the KeyValuePair<TKey,TValue> structure.

This code is part of a larger example provided for the Dictionary<TKey,TValue> class.

// When you use foreach to enumerate dictionary elements,
// the elements are retrieved as KeyValuePair objects.
Console.WriteLine();
foreach( KeyValuePair<string, string> kvp in openWith )
{
    Console.WriteLine("Key = {0}, Value = {1}",
        kvp.Key, kvp.Value);
}

' When you use foreach to enumerate dictionary elements,
' the elements are retrieved as KeyValuePair objects.
Console.WriteLine()
For Each kvp As KeyValuePair(Of String, String) In openWith
    Console.WriteLine("Key = {0}, Value = {1}", _
        kvp.Key, kvp.Value)
Next kvp

The Dictionary<TKey,TValue>.Enumerator.Current property returns an instance of this type.

The foreach statement of the C# language (For Each in Visual Basic) returns an object of the type of the elements in the collection. Since each element of a collection based on IDictionary<TKey,TValue> is a key/value pair, the element type is not the type of the key or the type of the value. Instead, the element type is KeyValuePair<TKey,TValue>. For example:

foreach( KeyValuePair<string, string> kvp in myDictionary )
{
    Console.WriteLine("Key = {0}, Value = {1}", kvp.Key, kvp.Value);
}

For Each kvp As KeyValuePair(Of String, String) In myDictionary
    Console.WriteLine("Key = {0}, Value = {1}", kvp.Key, kvp.Value)
Next kvp

The foreach statement is a wrapper around the enumerator, which allows only reading from, not writing to, the collection.

Gets the key in the key/value pair.

Gets the value in the key/value pair.

• IDictionary<TKey,TValue>
• Dictionary<TKey,TValue>.Enumerator
• DictionaryEntry

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